Clamp for molders  flasks



(NoModelJ E E JOSEP CLAMP FOR MOLDERS PLASKS, 6w. No; 424,988. PatentedApr. 8, 1890.

UNITED STATES PATENT OFFICE.

EDWARD E. JOSEF, OF BUFFALO, NEl/V YORK.

CLAMP FOR MOLDERS FLASKS, 81,0.

SPECIFICATION formingpart of Letters Patent No. 424,988, dated April 8,1890.

Application filed February 24, 1888. Serial No. 265,125- (No model.)

To aZZ whom it may concern.-

Be it known that I, EDWARD E. J OSEF, a citizen of the United States,residing at Buffalo, in the county of Erie and State of New York, haveinvented certain new and useful Improvements in Clamps for MoldersFlasks, &c.; and I do hereby declare the following to be a full, clear,and exact description of the invention, such as will enable othersskilled in the art to which it appertains to make and use the same,reference being had to the accompanying drawings, and to letters ofreference marked thereon, which form a part of this specification.

The object of my invention is to provide a suitable clamp for moldersflasks or other purposes which is capable of exerting the necessaryforce of a screw at the point required and of being instantly releasedfrom the screw, so that the clamping-pieces may be easily moved to andfro to accommodate them to flasks or other articles of different depths,whereby the force of a screw is only used Where a clamping power isrequired, all of which will be fully and clearly hereinafter describedand claimed, reference being had to the accompanying drawings, in whichFigure 1 is an inside elevation of the clamp. Fig. 2 is an outsideelevation of the same. Fig. 3 is a partial enlarged inside elevationwith the sliding portion removed. Figs. 4: and 5 are sectionalelevations illustrating the operation, and Fig. 6 shows a modified formof the device.

Referring to the drawings, a is one of the clamping-bars, having at oneend a clampingpiece a, and is provided with a longitudinal slot a anddepressions a a at each side of the slot, forming a slideway in whichthe other clampingbar b slides. At the open end of the clamping-bar a isa projecting case at, having an interiorcurved recess a and the curvedopen sockets to a on either side of the recess a The clamping-bar 1)consists of a bar adapted to slide to and fro in the slideway a a and isprovided on its back with a longitudinally arranged segmental femalescrew-thread b and upon the opposite side a longitudinal central rib band at outer end is the clamping-piece b 0 is a cylindrical portionprovided with trunnions O 0', one of which is provided with a leveror-thumb-piece C Upon the portion 0 is a segmental male screw-thread Gwhich screw only extends part way around, being cut away even with thesurface of the cylindrical portion 0 at 0 (see Fig. 3,) so that when thescrew-thread O is in engagement with the female screw h, as shown inFig. 5, the clamping-pieces are drawn to or from each other by the powerof a screw while turning the cylindrical portion 0 either way by meansof the lever C and when disengaged, as

shown in Fig. 4, by turning the lever 0 back far enough to release themale screw from the female screw the clamping-bar a is free to slideeither way in the slideway a a that is, when the portion of the cylinder0 from which the screw-thread C is cut away is opposite the segmentalfemale screw, there is nothing to hold the clamping-bars from beingmoved easily and adjusted to the article to be clampedafter which thepower of the screw is applied by turning the lever C so as to bring thescrews into engagement, as before mentioned.

In Fig. 6 I have shown the device provided with fastening-lugs d, withwhich to secure it to the edge of a carpenters or other bench for thepurpose of securing or clamping an object between the clamping-pieces.

From the foregoing description it will be noticed that the power of ascrew is only exerted for a short distance, and only at the point when ascrew-power is required to clamp an object tightly.

I claim as my invention- 1. A clamp for molders flasks or otherpurposes, consisting of a slotted bar provided with a clamping-piece atone end and at the opposite end a case a in combination with a barconstructed to slide longitudinally back and forth along the slottedbar, and provided with a clamping-piece at one end and at the back witha segmental female screw, and a cylinder 0, having a lever C mounted inthe case (1 and provided with a male screwthread C extending partlyaround it, so that it gears in with the female screw during a part ofits rotation only, whereby when the lever is turned over to one side itengages with the female screw, and when turned back the other Way it isreleased from the screw, so that both clamping-pieces may be easily andfreely moved longitudinally to or from each other, substantially asdescribed.

2. A clamp for molders flasks, &e., consisting of the slottedclamping-bar a (1 having the clamping-piece a" and interior slideway a(t the clamping-bar Z), having the segmental female screw thread Z),clampingpiece 0 and rib b and eyli11derC,with trunnions C O,1ever orthumb-piece C, and male screw 0 located in the projecting case a ofclamping-bar a, all combined and operating substantially as shown anddescribed.

3. A clamp for molders flasks, &c., consisting of the slottedclamping-bar ct having EDWARD E. JOSE'F. Witnesses:

W. T. MILLER, O'r'ro HODDICK.

